Combination height and caliper gage.



I c. $.11 Y. COMBINATION HEIGHT A ALIPEB GAGE.

AAAAAAAAAAAAAAAAA n. a, 1911. 1 v 1,033,346. Patented July 23, 1912.

iii

CHRITOPI-IER S. REAMY, 0F WALTHAM, MASSACHUSETTS.

COMBINATION HEIGHT AND CALIBER. GAGE.

V Specification of Letters Patent.

Patented July 23, 1912.

Application filed April 3, 1911. Serial No. 618,621.

To all whom it may concern:

Be it known that l, CHRISTOPHER S. Rnaur, citizen of the United States,resid ing at lValtham, in the county of Middlesex and State oflt'hissachusetts, have invented certain new and useful Improvements in(ombination Height and Caliper Gages, of which the following is aspecification.

The present invention comprehends certain new and useful improvements inmeasuring instruments for use in machine shops and the like, and theinvention relates more particularly to instruments of that type known assnap gages.

The snap gage in ordinary use consists of a single bar of metal which issubstantially C-shape in form and has its ends spaced apart at somepredetermined distance, the objects to be tested being placed betweenthe said ends of the bar to ascertain whether or not they are ofprecisely correct size. Of course the ends of the bar are soon worn awayby repeated use, and the entire lllStlll. ment must then be discardedsince its accuracy is destroyed. This is manifestly quite objectionable.as the instruments are expensive and their term of service iscomparatively short.

The object of the present invention is to obviate the objection abovenoted and to provide an improved instrument of this character which iscapable of being conveniently trued, when necessary, to compensate forwear.

For a full understanding of the invention, reference is to be had to thefollowing description and accompanying drawings in which:

Figure 1 is a perspective view of a snap gage constructed in accordancewith my in vention; Fig. 2 is a longitudinal section thereof; Fig. 3 isa detail perspective view of the spacing member detached; Fig. 4 showsthe instrument equipped with another form of gage arm carrying amicrometer head.

Corresponding and like parts are referred to in the followingdescription and indicated in all the views of the accompanying drawingsby the same reference characters.

My improved measuring instrument in cludes a pair of separate gage armswhich are designated 1 and 2 respectively. As the arms are substantialduplicates only one ofthe same will be specifically described. The armis formed at one end with an integral sleeve 3 which is substantiallycylindrical in form and extends transversely with respect to the arm.One end of the sleeve projects slightly laterally beyond one side of thearm. as indicated at 4. The terminal face of said projecting end of thesleeve is ground smooth and true to constitute an annular bearingsurface 5 which lies in a plane perpendicular to the axis of the bore ofthe sleeve. A nib 6 is formed integral with the other end of the arm andprojects laterally on the same side thereof as the sleeve. the terminalface of the nib being flat and lying in the salne plane as the bearingsurface 5.

The gage arms are connected together through the medium of a spacingmember which is interposed between the laterally projecting ends of thesleeves 3. The member is formed of solid metal and has a substantiallycylindrical periphery which is preferably of the same diameter as theexternal diameter of the sleeves. The gage arms may be secured to thespacing member in any approved manner, as for instance, by means ofthreaded studs 8 that extend axially from the ends of the member and fitin and project through the sleeves. The studs are of smaller diameterthan the spacing member in order to provide annular shoulders 9 at bothends of the member. The shoulders are ground smooth and true and lie inplanes perpendicular to the longitudinal axis of the member. Theseshoulders must be very carefully formed so as to be spaced apart apredetermined distance say, for instance, precisely one inch. Nuts 10are screwed on the projecting extremities of the threaded studs 8 andare tightened against the sleeves to retain the arms on the studs and tohold the bearing surfaces 5 firmly against the adjacent shoulders 9. Asthe terminal faces of the nibs 6 lie in the.same plane with therespective bearing surfaces 5. said nibs are held apart a distanceexactly equal to the length of the spacing member. Hence the instrumentmay be employed in the usual manner for testing parts of machines andother objects to ascertain Whether or not they are of pre cisely thecorrect size.

In practice. the arms may be quickly detached from the spacing memberand applied to another spacing member of a differ ent length. It iscontemplated to provide a set of spacing members of dltfcrent standsonding bearing surfaces 5 lie in the same p ane. In this manner thedefect may be easily and cheaply corrected, the wear compensated for,and the instrument rendered ready again foruse.

As shown in Fig. 4, the gage arm 1 may be formed at its outer end with aspring clip in lieu of a laterally projecting nib. The clip supports aconventional micrometer head 11 so that the spindle of the micrometer isdisposed in alinement with and is adjustable toward and away from thenib of thegage arm 2. The clip consists of a split sleeve 12 whichreceives the barrel of the micrometer, a screw 13 being arranged to drawthe portions of the sleeve together to'clamp the micrometer rigidly inposition.

This form of the instrument will be found particularly convenient wherefine measurements are required.

7 \Vhat I claim is:

A gage including a spacing member of predetermined length, a ga e armprojecting laterally from the mem er and formed with a nib projectingangularly on one side of the arm and having a flat terminal face, asleeve provided on the arm and extended beyond the same side thereof asthe nib, the extended portion of the sleeve having a flat terminalbearing surface abutting against one end of the spacing member and lyingin the plane of theterminal face of the nib, and fastening means passingthrough the sleeve and detachably securing the arm to the spacingmember.

In testimony whereof, I aflix my signature in presence of two witnesses.

CHRISTOPHER S. REAMY. [L- 8-]

